Underlease Un"der*lease, n. (Law)
A lease granted by a tenant or lessee; especially, a lease
granted by one who is himself a lessee for years, for any
fewer or less number of years than he himself holds; a
sublease. --Burrill.
[1913 Webster]

underlease — / ʌndəli:s/ noun lease from a tenant to another tenant … Marketing dictionary in english

underlease — / ʌndəli!s/ noun a lease from a tenant to another tenant … Dictionary of banking and finance

underlease — A lease by a lessee of a part of his unexpired term. Bedford v Terhune, 30 NY 451 A lease by a lessee of a part of the premises demised to him. 32 Am J1st L & T § 403 … Ballentine's law dictionary